Back Spasms & Cramps

So for a while now I’ve been having back spasms or something like it. It’s in my lower back in the middle of it. I will randomly get a sharp pain through my lower back if I bend over. It has even happened while I have been sitting and even standing. After the sharp pain happens there is this constant pain there it just doesn’t go away. I’m lower back is always hurting but to add to that I breastfeed and I haven had a period since I gave birth almost a year ago (in 6 days it will be a year). I now have cramps in my lower abdomen/pelvic area they aren’t as bad as period cramps but with my back it does cause it to be intense. Has anyone experienced this or may have any idea what could be going on?